Usun-Kyuyol (; , Uhun Küöl) is a rural locality (a selo), the only inhabited locality, and the administrative center of Ospyokhsky 1-y Rural Okrug of Ust-Aldansky District in the Sakha Republic, Russia, located from Borogontsy, the administrative center of the district. Its population as of the 2010 Census was 534, of whom 270 were male and 264 female, down from 385 as recorded during the 2002 Census.